<template>
  <div>
    <div class="search">
      <input v-model="keyword" class="search-input" type="text" placeholder="输入城市名或拼音" />
    </div>
    <div class="search-content" ref="search" v-show="keyword">
      <ul>
        <li
          class="search-item border-bottom"
          v-for="item in list"
          :key="item.id"
          @click="handleCityClick(item.name)"
        >{{item.name}}</li>
        <li class="search-item border-bottom" v-show="hasNoData">没有找到匹配数据</li>
      </ul>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapMutations } from 'vuex'
export default {
  name: 'CitySearch',
  props: {
    citys: Object
  },
  data () {
    return {
      keyword: '',
      list: [],
      timer: null
    }
  },
  methods: {
    handleCityClick (name) {
      this.changeCity(name) // mutation函数式映射
      // this.$store.dispatch('changeCity', name)
      this.$router.push('/') // 编程式路由
    },
    ...mapMutations(['changeCity'])
  },
  computed: {
    hasNoData () {
      return !this.list.length
    }
  },
  watch: { // 监控关键词数据变化
    keyword () {
      if (this.timer) {
        clearTimeout(this.timer)
      }
      if (!this.keyword) {
        this.list = []
        return
      }
      this.timer = setTimeout(() => {
        const result = []
        for (const i in this.citys) {
          this.citys[i].forEach(value => { // 遍历城市列表的每一项为value为一个城市对象，如果value的spell拼写里面包含关键词则压入结果
            if ((value.spell.indexOf(this.keyword)) > -1 || value.name.indexOf(this.keyword) > -1) {
              result.push(value)
            }
          })
          this.list = result
        }
      }, 13)
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.search)
  }
}
</script>

<style lang="stylus" scoped>
@import '~styles/varibles.styl'
.search
  height 0.72rem
  background $bgColor
  padding 0 0.1rem
  .search-input
    line-height 0.62rem
    width 100%
    text-align center
    border-radius 0.06rem
    height 0.62rem
    color #666
    box-sizing border-box
    padding 0.1rem
.search-content
  overflow hidden
  position absolute
  top 1.58rem
  left 0
  right 0
  bottom 0
  background #eee
  z-index 1
  .search-item
    line-height 0.62rem
    padding-left 0.2rem
    color #666
    background #fff
</style>
